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(No Model.) 2 Sheets-Sheet l.

O. LARSUN 8v J. W. CARLSON. DRILLSHARPENBR.

Patented Jan. '7, 1896.

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@No Model.) 2 Sheets-Sheet 2.

O. LARSON 8v J. W. CARLSON. DRILL SHARPBNER.

No. 552,843. Patented Jan. 7, 1896.

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UNITED STATES PATENT OFFICE.

OLE LARSON AND JOIIN IV. CARLSON, OF lVARDN-ER, IDAHO; SAID CARLSON ASSIGNOR OF ONE-SIXTH OF HIS RIGHT TO SAID LARSON.

DRILL-SHARPENER.

SPECIFICATION forming part of Letters Patent No. 552,843, dated January '7, 1896.

Application iilecl September l0, 1895. Serial No. 662,037. (No model.)

fo @ZZ whom it may concern: opening through which the drill is inserted, Be it known that we, OLE LARSON and JOHN such opening G coinciding in shape with the lV. CARLSON, of Wardner, in the county of cross-section of the drill and formed to readily Shoshone and State of Idaho, have invented receive the same. This guide also has hold- 5 5 certain new and usefulImprovements in Drilling-pieces g which are movable toward and Sharpeners, of which the following is aspeciifrom a common center and are operated in cation. both directions by means of a plate G", which This invention is an improvement in drillis provided with an opening to receive the sharpening machines, and has tor an object to holding-pieces, such opening having its walls 6o ro provide asimple and easily adjusted and operat g formed cam shape and engaging the ated machine by which to efficiently sharpen holding-pieces o in such manner as to force the so-called Burleigh or grooved drills. such pieces inward when the plate is properly The invention consists in certain novel conturned, and this plate has on its rear side structions and combinations of parts, as will grooves g2 made cam shape and similar to and 65 be hereinafter described, and pointed ont in so disposed with relation to the cam-faces g the claims. that such grooves g2 will tend to move the In the drawings, Figure l is a perspective pieces g outward, such pieces g having studs view of our improved drill-Sharpener. Fig. 2 or projections operating in Vthe grooves g2. A isacentral longitudinalsection of same. Fig. handle G2 projects from the plate and per- 7o zo 3 is a transverse section on the line 3 25, Fig. l. mits the same to be swung in one direction or Fig. i is a face view of the drill-guide and the other, a detent Gr3 serving to secure such holding-plates. Fig. 5 is a view of the rehandle and plate in one position or the other. verse side of the cam-grooves for releasing i The Sharpener proper includes a series of the drill-holding pieces. Fig. G is a face view bits movable toward and from a. common cen- 75 of the plate for holding the bits. Fig. 7 is a ter and holding devices for said bits and means sectional view on the line 7 7, Fig. 2. Fig. 8 for operating the same. These bits I-I are prefis a detail view of one ot' the bits, and Fig. 9 erably arranged correspondinglyto the wings is a detail of one of the holding-pieces. of the drill, and their sharpening operation is The frame A is adapted to support the holdeifected by moving them forcibly from their 8o 3o ing, guiding, and sharpening devices and is inner or meeting point outward. In the con- 'provided near one end with shears a., on which struction shown the bits center and meet in slides the base B of the holding device. This alignment with the guide-opening G, so that a base B slides back and forth on the shears a drill passed through said opening and pressed and is provided with the rearwardly-projected firmly against the bits will be sharpened by 8 5 rack-bar b mcshed by the toothed pinion C forcing such bits outward to their outermost jonrnaled in supports D, one of which has a position, causing them to scrape across the ratchet-segment d engaged by the pawl e of points of the win gs of the drills. These bits the lever C', which lever is fixed to and oper- `have portions iitting and engaging in slots 't' ates the segment Oand has the hand portion of a face-plate I and springs I engage the 9o 4o C2 for operating the pawl e so such pawl may bits and tend to force the same to their innerbe readily released. By this lever, rack-segmost position so that when at rest the bits will ment, and rack bar Z), the holding devices quickly assume such position in readiness for maybe moved baci; and forth upon the shears operation when a drill is inserted. To force a, as will be readily understood. On the basesuch bits outward we provide a hand-lever J 9 5 plate B is mounted the clamp for the drill, fixed to a shaft J', on which is secured an such clamp consisting of a iixed j awF and a armed wheel J 2, the arms of which engage the sliding jaw F' and a screw F2 by which the portions of the bits in rear of the face-plate I sliding jaw may be set to clamp the drilland the arms ji of the Wheel J 2 curve or incline shank. as shown so that the wheel maybe turned to Ico 5o The drill-guide is arranged in front of the force the bits outward, and that the tension of drill-holder and is provided with a central thesprings Ioperatingtoforcethebitsinward will also turn the wheel J2 tio set the same and its operating-lever back to the starting-point- In operation a drill such as shown may have its shank inserted and held in the jaws F I1", the head of the drill fitting in the opening Gr of the guide, and the holding-pieces g may be set in upon the wings of the drill, prior to which, however, such drill should have been forced Yby proper manipulation of the lever C to cause the point of the drill to bear firmly and tightly against the bits, the drill being held in such place by the detent-pawl e before described. Now by forcibly moving the bits outward, which can be accomplished by the lever devices before described, the drill will be sharpened. By moving the bits outward to sharpen the drill it will be seen that the portions scraped off during such sharpening operation will be delivered at the outer edges of the wings of the drill. In Vspecifically describing the bits they may be said to have sharpening portions ath near their inner ends and recesses or pocket portions 7L adjacent to and on the outer side'of said sharpening portions, as shown in the drawings.

Having thus described our invention, what we claim is-` l. In a drill sharpener the combination of holding devices the bits and means by which to force such bits in a direction from center outward the bits being adapted to sharpen the tool on their outward movement, substantially as set forth.

2. In a drill sharpener the combination with the holding devices of the bit support the bits movable in said support toward andfrom a common center and adapted to sharpen the tool on their outward movement and means by which to actuate such bits forcibly outward substantially as set forth.

3. In an apparatus substantially as described the combination of the bit support, the bits movable therein toward and from a common center, and adapted to sharpen the tool on their outward movement, spring devices for actuating such bits inward and means by which to forcibly move the bits outward substantially as set forth.

e. In an apparatus substantially as described the combination of the framing the drill holder movable along the same the drill guide provided with an opening for the passage of the drill and also with holding pieces movable toward and from said opening and the sharpening bits substantially as set forth.

5. In an apparatus substantially as described the combination of the framing the drill holder movable along the same, a lever and detent by which said drill holder maybe set to and held in any suitable position the drill guide having an opening for the passage of the drill and holding pieces movable toward and from such opening, the sharpening bits movable toward and from a common center and means by which to forcibly move such bits outward substantially as and for the purposes set forth.

6. In an Y apparatus substantially as described a Sharpener comprising a plurality of bits meeting at a central point and movable outward therefrom and adapted to sharpen the tool on their outward movement substantially asset forth.

7. In an apparatus substantially as described the combination of the bits movable outward from an inner or central position7 devices by which to press the drill bit end- Wise against the bitsand means by which to move the bits forcibly outward substantially as set forth.

8. In an apparatus substantially as described the combination with the outwardly movable bits and their support, of the armed wheel engaging such bits and the handle lever connected with such armed wheel substantially as set forth.

9. In an apparatus substantially as described the combination with the guide of the face plate having an opening formed with cam walls and provided in its inner face with cam grooves and the holding pieces arranged for engagement by the cam Walls of face plate opening and having pins or projections entering the grooves thereof substantially as and for the purposes set forth.

10. In an apparatus substantially as described the combination with a suitable support of the bits movable outward from an inner or cent-ral position, such bits having sharpening portions near their inner ends and recesses or pockets adjacent to and on. the outer sides of said sharpening portions and means by which to move said bits outward substantially as and for the purposes set forth.

OLE LARSON. JOHN NV. CARLSON. lVitnesses:

GEo. II. TRUMBULL, JAMEs E. GYDE.

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